Phonet: restore flow control credits when sending fails

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index b2a3ae6cad78e28324e23b857dc0a5773f569786..5034f0f62bdb7e3ae8e20227975e5986c14e6270 100644 (file)
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -834,6 +834,7 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
 {
        struct pep_sock *pn = pep_sk(sk);
        struct pnpipehdr *ph;
+       int err;
 
        if (pn_flow_safe(pn->tx_fc) &&
            !atomic_add_unless(&pn->tx_credits, -1, 0)) {
@@ -852,7 +853,10 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
                ph->message_id = PNS_PIPE_DATA;
        ph->pipe_handle = pn->pipe_handle;
 
-       return pn_skb_send(sk, skb, &pipe_srv);
+       err = pn_skb_send(sk, skb, &pipe_srv);
+       if (err && pn_flow_safe(pn->tx_fc))
+               atomic_inc(&pn->tx_credits);
+       return err;
 }
 
 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,